JP6467367B2 - Pressure regulating valve - Google Patents

Description

  The present invention relates to a pressure regulating valve that regulates the pressure of a fluid flowing through a pipe. More specifically, the present invention relates to a pressure regulating valve that can prevent the attached portion from being enlarged in the radial direction when attached to a pipe.

  The pressure regulating valve is described in Patent Document 1. The pressure regulating valve of Patent Document 1 includes a valve chamber including a fluid inlet and a fluid outlet. The pressure regulating valve includes an annular valve seat, a valve chamber passage that connects the fluid inlet and the fluid outlet via a central hole of the valve seat, and the valve seat from the side opposite to the fluid inlet in the valve seat. And a coil spring that urges the valve body to a blocking position that contacts the valve seat and blocks the valve chamber flow path. The fluid inlet and the valve seat are provided coaxially, and the valve body moves in the axial direction thereof.

  The pressure regulating valve of Patent Document 1 is configured integrally with a pipe in a state where a fluid inlet is opened on the inner wall surface of the pipe through which fluid flows. In the configuration in which the pressure regulating valve and the pipe are integrated, the valve chamber is located on the outer peripheral side of the pipe, and the moving direction of the valve element is orthogonal to the pipe axis direction of the pipe. Here, when the pressure of the fluid flowing through the pipe is equal to or lower than the set pressure, the pressure regulating valve is a fluid inlet that opens to the inner wall surface of the pipe, with the valve body in contact with the valve seat by the biasing force of the coil spring. To the fluid outlet is closed off. On the other hand, when the pressure of the fluid flowing through the pipe exceeds the set pressure, the valve body moves in the axial direction against the biasing force of the coil spring due to the pressure of the fluid and is separated from the valve seat. As a result, the fluid inlet and the fluid outlet communicate with each other, so that the fluid in the pipe is discharged from the fluid outlet through the valve chamber flow path. Therefore, the pressure of the fluid flowing through the pipe returns to the set pressure or lower.

JP-A-8-326941

  In the pressure regulating valve of Patent Document 1, the valve chamber is located on the outer peripheral side of the pipe when the pressure regulating valve is attached to the pipe. Therefore, there exists a problem that the attachment part of the pressure control valve in piping will enlarge in radial direction.

  In view of such a point, an object of the present invention is to provide a pressure regulating valve that can suppress the enlargement of the attached portion in the radial direction when attached to a pipe.

In order to solve the above-described problem, the present invention provides a pressure regulating valve that is disposed between a first pipe and a second pipe and adjusts the pressure of a fluid flowing through the first pipe and the second pipe. The first opening that communicates with the first pipe, the second opening that communicates with the second pipe, the fluid outlet, the annular valve seat, and the first opening and the fluid outlet through the central hole of the valve seat. A valve chamber, and a valve body disposed on the downstream side of the valve seat in the fluid flow direction from the first opening toward the fluid outlet, and the valve body. And an urging member that urges the valve seat to a shut-off position that shuts off the valve chamber flow path, and the valve body passes through the central hole of the valve seat and the first opening. A first pressure receiving surface that receives the pressure of the fluid on the first pipe side, and the second opening through the second opening. A second pressure receiving surface that receives the pressure of the fluid on the tube side, and a valve body channel that has one end opening in the first pressure receiving surface and the other end opening in the second pressure receiving surface. When the differential pressure between the pressure of the fluid applied to the pressure receiving surface and the pressure of the fluid applied to the second pressure receiving surface is greater than the urging force of the urging member, the valve body is separated from the valve seat and One opening and the fluid outflow port communicate with each other.

  The pressure regulating valve of the present invention is disposed between a first pipe and a second pipe through which fluid flows, and a second opening to which a first opening to which the first pipe is connected and a second pipe are connected. The opening is connected by a valve body channel provided in the valve body. Therefore, it is possible to position the valve chamber on the pipe shafts of the first pipe and the second pipe and overlap the pipe shaft and the valve body. Therefore, when a pressure regulation valve is attached to piping (between 1st piping and 2nd piping), it can suppress that an attaching part enlarges in the diameter direction of piping. Here, in the pressure regulating valve, the differential pressure between the fluid pressure received by the first pressure receiving surface and the fluid pressure received by the second pressure receiving surface is larger than the urging force of the urging member that urges the valve body to the valve seat. Then, the valve body is separated from the valve seat, and the first opening and the fluid outlet are in communication. Thereby, since the fluid which flows through piping (1st piping and 2nd piping) is discharged | emitted from a fluid outflow port, the pressure of the fluid in piping is adjusted.

  In the present invention, it is preferable that an area of the first pressure receiving surface is larger than an area of the second pressure receiving surface. If it does in this way, when the pressure of the fluid of the 1st piping side rather than a valve body rises exceeding a predetermined pressure, a fluid will be made to flow out from a fluid outflow port, and the pressure can be reduced.

In the present invention, the first opening, the valve seat, the second opening, and the valve body are coaxial, and the valve body is in an axial direction between the second opening and the valve seat. The urging member moves and is preferably a coil spring and is arranged coaxially with the valve body. If it does in this way, the moving direction of the valve body which opens and closes a valve chamber flow path can be made to correspond with the pipe axis of piping (1st piping and 2nd piping). In addition, the coil spring that urges the valve element can also be oriented in the axial direction of the pipe. Therefore, when the pressure regulating valve is attached to the pipe, it can be further suppressed that the attached portion is enlarged in the radial direction of the pipe. Here, it is necessary to lengthen the coil spring in order to accurately set the pressure of the fluid in the pipe in which the valve body is separated from the valve seat (the pressure of the fluid in which the pressure regulating valve operates). That is, if the coil spring is lengthened, the urging force for urging the valve body with a margin can be adjusted within a range in which the coil spring is not plastically deformed by the movement of the valve body. In response to such a requirement, if the coil spring is arranged coaxially with the valve body, even if the coil spring is lengthened in the axial direction, it is possible to suppress the portion where the pressure regulating valve is attached from being enlarged in the radial direction of the pipe. Therefore, it is possible to accurately set the pressure of the fluid on which the pressure regulating valve operates while suppressing the attachment portion of the pressure regulating valve from being enlarged in the radial direction of the pipe.

  In the present invention, the valve chamber includes a first inner wall surface in which the first opening is formed, an annular inner wall surface extending in the axial direction on the outer peripheral side of the valve body, and the first chamber in a state surrounding the first opening. 1 has a cylindrical valve seat constituting portion that protrudes in the axial direction from the inner wall surface and includes the valve seat at the tip, and the fluid outlet is formed on the annular inner wall surface, and the outer circumferential surface of the valve body and the annular shape A gap is formed between the inner wall surface, the valve chamber passage passes through a central hole of the valve seat component and the gap, and the first pressure receiving surface is the valve seat in the valve body. It is desirable that it is an end surface part exposed inside the said valve seat structure part when the said valve body contact | abuts to the said valve seat among the end surfaces of this side. If it does in this way, while providing a valve seat and a valve chamber flow path in a valve chamber, the 1st pressure receiving surface which receives the pressure of the fluid by the side of the 1st piping can be provided in a valve body.

In this case, it is desirable that the pressure loss of the fluid when flowing through the gap is larger than the pressure loss of the fluid flowing through the valve body flow path. In this way, when the valve body is separated from the valve seat and the first opening communicates with the fluid outlet, the flow rate of the fluid flowing from the first opening to the second opening via the valve body flow path is remarkably high. It can be prevented from decreasing. Further, when the first opening communicates with the fluid outlet, it is possible to prevent or suppress a large amount of fluid being discharged from the fluid outlet at a time and the pressure in the pipe rapidly decreasing.

  In this invention, it has a 1st valve chamber structural member provided with the said 1st inner wall surface, and a 2nd valve chamber structural member which has a cylindrical part provided with the said annular inner wall surface, The said coil spring is a said 1st opening. An end portion on the side of the second portion abuts on the valve body, an end portion on the side of the second opening abuts on a contact portion provided in the second valve chamber constituting member, and the first valve chamber constituting member is An outer peripheral side of the cylindrical portion is provided with an annular wall portion extending in the axial direction, the cylindrical portion is provided with a male screw on an outer peripheral surface, and the annular wall portion can be screwed with the male screw on an inner peripheral surface. It is desirable to provide an internal female screw. In this case, the first inner wall surface and the second valve chamber are driven by rotating the first valve chamber constituent member and the second valve chamber constituent member relative to each other around the axis and screwing the male screw and the female screw. The component member can be made to approach in the axial direction. In addition, the first valve chamber constituent member and the second valve chamber constituent member are relatively rotated around the axis to loosen the male screw and the female screw, thereby connecting the first inner wall surface and the second valve chamber constituent member in the axial direction. Can be separated. Here, the end portion on the first opening side of the coil spring is in contact with a valve body that is in contact with a valve seat constituting portion placed on the first inner wall surface. On the other hand, the end portion on the second opening side of the coil spring is in contact with a contact portion provided in the second valve chamber constituting member. Therefore, when the first inner wall surface and the second valve chamber constituent member are brought close to each other in the axial direction, the coil spring positioned between the valve body and the second valve chamber constituent member is compressed, and the coil spring causes the valve body to be compressed. The urging force that urges the valve seat can be increased. Further, if the first inner wall surface and the second valve chamber constituent member are separated from each other in the axial direction, a coil spring positioned between the valve body and the second valve chamber constituent member is extended, and the coil spring causes the valve body to be extended. The urging force that urges the valve seat can be reduced. Therefore, the pressure of the fluid in the piping when the valve body is separated from the valve seat (the pressure of the fluid that operates the pressure adjusting valve) can be adjusted.

  In the present invention, in order to provide the valve body with the second pressure receiving surface, the valve chamber includes a second inner wall surface in which the second opening is formed, and a tubular shape that guides the valve body in the axial direction. A guide portion, the guide portion extending coaxially with the annular inner wall surface from the second inner wall surface toward the first inner wall surface side, and the valve body from the valve seat side to the second opening A large-diameter portion that can contact the valve seat, and a small-diameter portion that is smaller in diameter than the large-diameter portion, extends from the large-diameter portion in the axial direction, and is inserted into the guide portion. The small diameter portion is fitted to the guide portion in a state of being movable in the axial direction, and the second pressure receiving surface is an end surface of the small diameter portion on the side of the second opening, The second pressure receiving surface and the second inner wall surface are preferably separated from each other. In this way, the valve body can be moved along the axis.

  In the present invention, the coil spring is disposed coaxially with the guide portion on the outer peripheral side of the guide portion, and the end portion on the first opening side of the coil spring is located on the large diameter portion of the valve body. It is desirable to contact from the opening side. In this way, the coil spring is disposed on the outer peripheral side of the valve body so as to surround the valve body. Therefore, it is possible to suppress the pressure regulating valve from becoming larger in the axial direction than when the coil spring and the valve body are arranged in the axial direction.

It is explanatory drawing of the fuel supply system which attached the pressure regulating valve of this invention in the middle of piping. It is an external appearance perspective view of the pressure control valve of this invention. It is a longitudinal cross-sectional view of the pressure regulating valve of the present invention. It is explanatory drawing of the pressure adjustment operation | movement by a pressure adjustment valve.

  Hereinafter, a pressure regulating valve according to an embodiment of the present invention will be described with reference to the drawings.

(Fuel supply system)
FIG. 1 is an explanatory view of a fuel supply system in which a pressure regulating valve of the present invention is attached in the middle of a pipe. FIG.
FIG. 2 is an external perspective view of a pressure regulating valve of the present invention. The pressure regulating valve 1 of this example is used in a fuel supply system 2 that supplies a fuel G such as gasoline to an internal combustion engine (not shown) such as an engine.

  As shown in FIG. 1, the fuel supply system 2 includes a fuel tank 5 that stores fuel G, a pump 7 that is inserted into the fuel tank 5 through the opening 6 of the fuel tank 5 and submerged in the liquid, a pump 7 and a pipe 8 for communicating the internal combustion engine with each other. The pipe 8 is drawn out from the inside of the fuel tank 5 through a through hole 9 a provided in an opening / closing lid 9 detachably attached to the opening 6 of the fuel tank 5. The fuel supply system 2 includes a filter 10 attached in the middle of the pipe 8 in the fuel tank 5 and a pressure regulating valve 1 attached between the filter 10 and the pump 7 in the pipe 8. The pipe 8 is a flexible tube, and a first pipe 11 located on the upstream side of the pressure regulating valve 1 in the flow direction S of the fuel G from the pump 7 toward the internal combustion engine, and a second pipe 12 located on the downstream side. Is provided. The opening / closing lid 9 is provided with a packing 9b for sealing the space between the fuel tank 5 and the fuel tank 5.

  When the pump 7 is driven, the fuel G in the fuel tank 5 is supplied to the internal combustion engine via the pressure regulating valve 1 and the filter 10. The filter 10 may be installed between the pressure regulating valve 1 and the pump 7.

(Pressure adjustment valve)
As shown in FIG. 2, the pressure regulating valve 1 includes a first valve chamber constituent member 22 including a first connection pipe portion 21 connected to the first pipe 11 and a second connection pipe connected to the second pipe 12. The second valve chamber constituting member 32 including the portion 31 is provided. The first connecting pipe portion 21 and the second connecting pipe portion 31 are coaxial and extend on the axis L in opposite directions. Therefore, the pressure regulating valve 1 is coaxially attached to the pipe 8 (the first pipe 11 and the second pipe 12).

  The first valve chamber constituting member 22 includes a hexagonal nut portion 23 on the outer peripheral surface when viewed from the direction of the axis L. A lock nut 24 is attached to a portion of the second valve chamber constituting member 32 on the first valve chamber constituting member 22 side. A fuel discharge passage 33 that passes through the second valve chamber constituting member 32 in a direction perpendicular to the axis L is opened at a portion of the second valve chamber constituting member 32 located above the lock nut 24. As shown in FIG. 1, when the pressure regulating valve 1 is attached to the pipe 8 of the fuel supply system 2, the opening of the fuel discharge path 33 is located above the liquid level of the fuel G in the fuel tank 5. .

  FIG. 3 is a longitudinal sectional view of the pressure regulating valve 1 cut along the axis L. FIG. In the following description, the pressure control valve 1 is defined as a reference posture of the pressure regulating valve 1 in which the axis L is directed in the vertical direction and the first connecting pipe portion 21 is positioned on the lower side. Will be explained.

  As shown in FIG. 3, the first valve chamber constituting member 22 includes a first connecting pipe portion 21, a nut portion 23, and an annular shape located between the first connecting pipe portion 21 and the nut portion 23 in the axis L direction. The plate part 25 and the through-hole 26 which penetrates these are provided. The annular plate portion 25 has a larger outer diameter than the first connecting tube portion 21 and is provided coaxially with the first connecting tube portion 21. The nut portion 23 is annular and extends upward in the direction of the axis L from the outer peripheral edge of the annular plate portion 25. A female screw 27 is provided on the inner peripheral surface of the nut portion 23. The through hole 26 extends in the direction of the axis L with a constant diameter. The first connecting pipe portion 21, the annular plate portion 25, the nut portion 23, and the through hole 26 are coaxial.

The second valve chamber constituting member 32 includes a second connecting pipe portion 31 and a valve chamber constituting member large diameter portion 34 having a larger outer diameter than the second connecting pipe portion 31 below the second connecting pipe portion 31. Prepare for the same axis. Further, the second valve chamber constituting member 32 includes a through hole 35 penetrating vertically along the axis L. The through-hole 35 has a large-diameter hole 36, a medium-diameter hole 37 having a smaller inner diameter than the large-diameter hole 36, and a small-diameter hole having a smaller inner-diameter than the medium-diameter hole 37. The part 38 is provided coaxially in this order.
Between the large-diameter annular inner wall surface (annular inner wall surface) 41 defining the large-diameter hole portion 36 in the second valve chamber constituting member 32 and the medium-diameter annular inner wall surface 42 defining the medium-diameter hole portion 37. A first annular surface 43 that is orthogonal to the axis L and faces downward is formed. In addition, the axis L between the medium-diameter annular inner wall surface 42 that defines the medium-diameter hole portion 37 and the small-diameter annular inner wall surface 44 that defines the small-diameter hole portion 38 in the second valve chamber constituting member 32. A second annular surface (second inner wall surface) 45 that is orthogonal to and faces downward is formed. The second annular surface 45 is located on the inner peripheral side of the valve chamber constituting member large diameter portion 34.

  The tubular portion 50 including the large-diameter hole portion 36 on the inner peripheral side in the large-diameter portion 34 of the valve chamber constituting member includes a fuel discharge passage 33 penetrating in the direction orthogonal to the axis L at the upper end portion. A male screw 51 is provided on the outer peripheral surface portion of the outer peripheral surface of the cylindrical portion 50 below the fuel discharge passage 33. The female screw 27 of the nut portion 23 of the first valve chamber constituting member 22 can be screwed into the male screw 51. The lock nut 24 can be screwed onto the male screw 51.

  Here, the nut portion 23 of the first valve chamber constituting member 22 is positioned on the outer peripheral side of the cylindrical portion 50 of the second valve chamber constituting member 32, and the male screw 27 of the cylindrical portion 50 is connected to the female screw 27 of the nut portion 23. It is fastened to the second valve chamber constituting member 32 in a state where the screw 51 is screwed. And the 1st valve chamber structural member 22 and the 2nd valve chamber structural member 32 make the lock nut 24 screwed in the external thread 51 of the 2nd valve chamber structural member 32 contact the nut part 23 from upper direction. It is fixed by.

  When the first valve chamber constituting member 22 and the second valve chamber constituting member 32 are fastened, the valve chamber 55 is partitioned by the first valve chamber constituting member 22 and the second valve chamber constituting member 32. More specifically, the valve chamber 55 is lower than the upper surface (first inner wall surface) 25a of the annular plate portion 25 of the first valve chamber constituting member and the second valve chamber constituting member 32 in the nut portion 23. And the large-diameter annular inner wall surface 41, the first annular surface 43, the medium-diameter annular inner wall surface 42, and the second annular surface (second inner wall surface) of the second valve chamber constituting member 32. 45.

The valve chamber 55 includes a first opening 56 that communicates with the first pipe 11, a second opening 57 that communicates with the second pipe 12 , a fuel outlet (fluid outlet) 58, and a valve seat 59. A valve body 60 and a coil spring (biasing member) 61 are accommodated in the valve chamber 55. The valve chamber 55 includes a cylindrical guide portion 62 that guides the valve body 60 in the direction of the axis L.

  The first opening 56 is formed at the center of the upper surface 25 a of the annular plate portion 25 of the first valve chamber constituting member 22. That is, the first opening 56 is an upper end opening of the through hole 26 that penetrates the first valve chamber constituting member 22. Accordingly, the first opening 56 communicates with the first pipe 11 via the first connecting pipe portion 21. The second opening 57 is a central opening of the second annular surface 45 of the second valve chamber constituting member 32. Accordingly, the second opening 57 communicates with the second pipe 12 via the second connection pipe portion 31. The fuel outlet 58 is an opening of the fuel discharge passage 33 that passes through the second valve chamber constituting member 32 in a direction orthogonal to the axis L, and is formed at the upper end portion of the large-diameter annular inner wall surface 41. The fuel outlets 58 are provided at two locations separated by 180 ° around the axis L.

The valve seat 59 is an opening edge of the upper end opening of the valve seat component that protrudes in the direction of the axis L in a state of surrounding the first opening 56 from the upper surface 25 a of the annular plate portion 25 of the first valve chamber component 22. In this example, the valve seat component is composed of a valve seat component 65 that is separate from the first valve chamber component 22. The valve seat constituting member 65 is a cylindrical member provided with a valve seat 59 at the opening edge of one opening. The valve seat constituent member 65 is placed on the upper surface 25 a with the valve seat 59 side facing away from the upper surface 25 a of the annular plate portion 25, and surrounds the first opening 56. Further, the upper end portion of the valve seat constituting member 65 is inserted into the inner peripheral side of the cylindrical portion 50 of the second valve chamber constituting member 32, whereby the valve seat 59 (valve seat constituting member 65) is The first opening 56 and the second opening 57 are arranged coaxially. The inner diameter dimension of the valve seat component 65 (the inner diameter dimension of the opening of the valve seat 59 ) is larger than the inner diameter dimension of the first opening 56. The valve seat constituting member 65 can also be formed integrally with the first valve chamber constituting member 22.

  The valve body 60 is disposed on the side opposite to the first opening 56 with respect to the valve seat 59. That is, the valve body 60 is disposed on the upper side of the valve seat 59 and moves between the valve seat 59 and the second opening 57 in the direction of the axis L. The valve body 60 includes a large-diameter portion 68 and a small-diameter portion 69 that is smaller in outer diameter than the large-diameter portion 68 and provided coaxially with the large-diameter portion 68 in this order from the bottom to the top. The large-diameter portion 68 and the small-diameter portion 69 have a circular contour shape when viewed from the direction of the axis L. The large diameter portion 68 has a constant thickness dimension in the direction of the axis L, and the lower end thereof is a lower end surface 71 that extends in a direction orthogonal to the axis L. The small diameter portion 69 extends in the axis L direction with a constant outer diameter. The upper end of the small diameter portion 69 is an upper end surface 72 that extends in a direction orthogonal to the axis L.

  The valve body 60 includes a valve body flow path 73 that passes through the valve body 60 coaxially with the axis L. The valve body channel 73 extends linearly, and the lower end thereof opens at the center of the lower end surface 71 of the valve body 60. The upper end of the valve body channel 73 opens at the center of the upper end surface 72 of the valve body 60.

Next, the guide part 62 is cylindrical and extends coaxially with the large-diameter annular inner wall surface 41 downward from the second annular surface 45 having the second opening 57. The guide part 62 surrounds the second opening 57. The valve body 60 has a small-diameter portion 69 inserted into the guide portion 62 from below, and is fitted to the guide portion 62 so as to be movable in the direction of the axis L. In this example, the guide part 62 is a separate body from the second valve chamber constituting member 32 and is formed of a cylindrical guide member. The guide part 62 is inserted into the medium diameter hole part 37 from the lower side, and the upper end surface thereof is brought into contact with the second annular surface 45. Further, the lower end portion of the guide portion 62 protrudes downward from the first annular surface 43. In addition, the guide part 62 can also be formed integrally with the second valve chamber constituting member 32.

  In a state where the small diameter portion 69 of the valve body 60 is inserted into the guide portion 62, the large diameter portion 68 of the valve body 60 is disposed coaxially with the large diameter annular inner wall surface 41. Here, the outer diameter dimension of the large diameter portion 68 of the valve body 60 is shorter than the inner diameter dimension of the large diameter annular inner wall surface 41. Therefore, a gap 75 is formed between the valve body 60 (large diameter portion 68) and the large diameter annular inner wall surface 41 of the valve chamber 55.

  The coil spring 61 urges the valve body 60 to a blocking position 60 </ b> A that contacts the valve seat 59. The coil spring 61 is disposed so as to surround the guide portion 62 on the outer peripheral side of the guide portion 62. In other words, the coil spring 61 is disposed on the outer peripheral side of the small diameter portion 69 of the valve body 60 so as to surround the small diameter portion 69. The lower end of the coil spring 61 contacts the large diameter portion 68 of the valve body 60 from above. The upper end of the coil spring 61 contacts the first annular surface 43 of the second valve chamber constituting member 32 from below. The coil spring 61 is compressed in the direction of the axis L between the large diameter portion 68 of the valve body 60 and the first annular surface 43 of the second valve chamber constituting member 32.

  Here, of the lower end surface 71 of the valve body 60 (the lower end surface 71 of the large-diameter portion 68), when the valve body 60 is disposed at the shut-off position 60A, the inner side of the valve seat constituting member 65 from the center hole of the valve seat 59. The exposed end surface portion is a first pressure receiving surface 76 that receives the pressure of the fuel G on the first pipe 11 side through the center hole of the valve seat 59 and the first opening 56. In a state where the valve body 60 is disposed at the cutoff position 60A, the upper surface 25a of the annular plate portion 25 in which the first opening 56 is formed and the first pressure receiving surface 76 are separated in the direction of the axis L. Accordingly, the first pressure receiving surface 76 receives the pressure of the fuel G on the first pipe 11 side over the entire surface.

In addition, the upper end surface 72 of the valve body 60 (the upper end surface 72 of the small diameter portion 69) facing the second annular surface 45 in a state surrounded by the guide portion 62 is on the side of the second pipe 12 through the second opening 57. The second pressure receiving surface 77 receives the pressure of the fuel G. In a state in which the valve body 60 is disposed at the cutoff position 60A, the second annular surface 45 of the valve chamber 55 in which the second opening 57 is formed and the second pressure receiving surface 77 are separated from each other in the axis L direction. Therefore, the second pressure receiving surface 77 receives the pressure of the fuel G on the second pipe 12 side on the entire surface. The area of the first pressure receiving surface 76 is larger than the area of the second pressure receiving surface 77.

  Further, in the valve chamber 55, the first opening 56 and the fuel outlet 58 are connected via a central hole of the valve seat 59 and a gap 75 between the valve body 60 and the large-diameter annular inner wall surface 41. A valve chamber flow path 80 is formed (see FIG. 4).

  Here, in a state in which the valve body 60 is disposed at the blocking position 60A, the valve chamber flow path 80 is blocked. Further, the pressure loss of the fuel G when flowing through the valve chamber flow path 80 is larger than the pressure loss of the fuel G flowing through the valve body flow path 73. In this example, by adjusting the width of the gap 75 and the length of the gap 75, the pressure loss of the fuel G flowing through the valve chamber flow path 80 becomes the pressure loss of the fuel G flowing through the valve body flow path 73. It is set to be larger.

(Pressure adjustment operation)
In the fuel supply system 2 shown in FIG. 1, when the pressure of the fuel G supplied to the internal combustion engine rises more than necessary, a dangerous state is brought about. The pressure regulating valve 1 is attached in the middle of the pipe 8 in order to avoid such a situation.

  When the pressure of the fuel G pumped by the pump 7 is equal to or lower than a predetermined pressure, the pressure regulating valve 1 is configured to receive the pressure of the fuel G received by the first pressure receiving surface 76 of the valve body 60 (on the upstream side of the valve body 60). The differential pressure between the pressure of the fuel G) and the pressure of the fuel G received by the second pressure receiving surface 77 (the pressure of the fuel G downstream of the valve body 60) biases the valve body 60 toward the valve seat 59. It is smaller than the urging force of. Accordingly, the valve body 60 is maintained at the blocking position 60 </ b> A that contacts the valve seat 59. Thereby, since the valve chamber flow path 80 is blocked, the fuel G flows from the first opening 56 to the second opening 57 via the valve body flow path 73.

  On the other hand, when the pressure of the fuel G pumped by the pump 7 exceeds a predetermined pressure, the differential pressure between the pressure of the fuel G received by the first pressure receiving surface 76 and the pressure of the fuel G received by the second pressure receiving surface 77 is It becomes larger than the urging force. In this case, as shown in FIG. 4, the valve body 60 moves in the direction away from the valve seat 59 (upward) in the axis L direction against the biasing force of the coil spring 61. Thereby, the shut-off state of the valve chamber flow path 80 is released, and the first opening 56 and the fuel outlet 58 communicate with each other. Accordingly, the fuel G flowing through the pipe 8 (the first pipe 11 and the second pipe 12) is discharged from the fuel discharge path 33 to the outside of the pressure regulating valve 1 via the valve chamber flow path 80 and the fuel outlet 58. Therefore, the pressure of the fuel G flowing through the pipe 8 from the first pipe 11 toward the second pipe 12 decreases.

  Thereafter, when the differential pressure between the pressure of the fuel G received by the first pressure receiving surface 76 and the pressure of the fuel G received by the second pressure receiving surface 77 becomes equal to or less than the biasing force of the coil spring 61, the valve body 60 is moved by the biasing force of the coil spring 61. It approaches the valve seat 59 and returns to the shut-off position 60A in contact with the valve seat 59. Accordingly, the valve chamber flow path 80 is blocked, and the fuel G flows from the first opening 56 to the second opening 57 via the valve body flow path 73.

  The moving range of the valve body 60 toward the second opening 57 (upward) is defined by the guide portion 62. That is, the valve body 60 can move upward until the large diameter portion 68 abuts against the opening edge at the lower end of the guide portion 62. Here, even when the large diameter portion 68 of the valve body 60 is in contact with the opening edge of the lower end of the guide portion 62, the second annular surface 45 and the second pressure receiving surface of the valve chamber 55 in which the second opening 57 is formed. 77 (the upper end surface 72 of the small diameter portion 69) is spaced apart in the direction of the axis L.

(Function and effect)
The pressure regulating valve 1 of this example is attached to the pipe 8 with the valve chamber 55 positioned on the pipe shafts of the first pipe 11 and the second pipe 12 and the pipe shaft and the valve body 60 being overlapped. Yes. The valve chamber 5
5, the first opening 56 connected to the first pipe 11, the second opening 57 connected to the second pipe 12, the valve seat 59, and the valve body 60 are coaxial, and the valve body 60 is in the direction of the axis L. Move to. Further, a coil spring 61 that urges the valve body 60 to the blocking position 60 </ b> A is disposed coaxially with the valve body 60. Therefore, when the pressure regulating valve 1 is attached to the pipe 8 (between the first pipe 11 and the second pipe 12), it is possible to prevent the attached portion from being enlarged in the radial direction of the pipe 8. Therefore, as shown in FIG. 1, when the attachment portion where the pressure adjustment valve 1 is attached in the pipe 8 is positioned in the fuel tank 5, the pressure adjustment valve 1 is connected to the fuel tank via the opening 6 of the fuel tank 5. 5 can be inserted.

  In the pressure regulating valve 1, the axis L of the coil spring 61 that urges the valve body 60 is oriented in the tube axis direction. Therefore, even when the coil spring 61 is elongated in the direction of the axis L, it is possible to prevent the attachment portion of the pressure regulating valve 1 from being enlarged in the radial direction of the pipe 8. Further, the coil spring 61 is disposed on the outer peripheral side of the small diameter portion 69 of the valve body 60. Therefore, even when the coil spring 61 is elongated in the axis L direction, the pressure regulating valve 1 is prevented from being elongated in the axis L direction compared to the case where the coil spring 61 and the valve body 60 are arranged in the axis L direction. it can. Therefore, according to this example, the coil spring 61 is lengthened while suppressing the mounting portion of the pressure regulating valve 1 from being enlarged in the radial direction of the pipe 8 and the pressure regulating valve 1 becoming larger in the axis L direction. be able to. Here, if the coil spring 61 is lengthened, the pressure of the fuel G in the pipe 8 (the pressure of the fuel G at which the pressure regulating valve 1 operates) when the valve body 60 is separated from the valve seat 59 can be set with high accuracy. That is, if the coil spring 61 is lengthened, the biasing force that biases the valve body 60 with a margin can be adjusted within a range in which the coil spring 61 is not plastically deformed by the movement of the valve body 60.

  Further, in this example, the pressure loss of the fuel G when flowing through the gap 75 of the valve chamber flow path 80 is set to be larger than the pressure loss of the fuel G flowing through the valve body flow path 73. Therefore, when the valve body 60 is separated from the valve seat 59 and the first opening 56 and the fuel outlet 58 communicate with each other, the fuel G flowing from the first opening 56 to the second opening 57 via the valve body flow path 73. It is possible to prevent the flow rate of the gas from being significantly reduced. Further, when the first opening 56 and the fuel outlet 58 communicate with each other, it is possible to prevent or suppress a large amount of fuel G being discharged from the fuel outlet 58 at a time and the pressure in the pipe 8 rapidly decreasing.

  Moreover, in this example, the 1st valve chamber structural member 22 and the 2nd valve chamber structural member 32 are fastened with the screw | thread. Accordingly, the first valve chamber constituting member 22 and the second valve chamber constituting member 32 are relatively rotated around the axis L, and the first valve chamber constituting member is connected to the male screw 51 of the cylindrical portion 50 of the second valve chamber constituting member 32. Thus, the annular plate portion 25 of the first valve chamber constituting member 22 and the second valve chamber constituting member 32 can be brought close to each other in the direction of the axis L. Further, the first valve chamber constituting member 22 and the second valve chamber constituting member 32 are relatively rotated around the axis L, and the first valve chamber constituting member is connected to the male screw 51 of the cylindrical portion 50 of the second valve chamber constituting member 32. By loosening the female screw 27 of the nut portion 23 of the 22, the annular plate portion 25 of the first valve chamber constituting member 22 and the second valve chamber constituting member 32 can be separated in the axis L direction.

Here, the end portion of the coil spring 61 on the first opening 56 side is in contact with the valve body 60 that contacts the valve seat constituting member 65 placed on the upper surface 25 a of the annular plate portion 25 of the first valve chamber constituting member 22. It touches. On the other hand, the end portion of the coil spring 61 on the second opening 57 side is in contact with a first annular surface 43 (contact portion) provided in the second valve chamber constituting member 32. Therefore, if the annular plate portion 25 of the first valve chamber constituting member 22 and the second valve chamber constituting member 32 are brought close to each other in the axis L direction, the valve body 60 and the second valve chamber constituting member 32 are located. The coil spring 61 can be compressed, and the biasing force by which the coil spring 61 biases the valve body 60 toward the valve seat 59 can be increased. Further, if the annular plate portion 25 of the first valve chamber constituting member 22 and the second valve chamber constituting member 32 are separated in the direction of the axis L, they are located between the valve body 60 and the second valve chamber constituting member 32. The coil spring 61 can be extended to reduce the urging force that the coil spring 61 urges the valve body 60 toward the valve seat 59. That is, in the pressure regulating valve 1 of this example, when the first valve chamber constituting member 22 and the second valve chamber constituting member 32 are relatively rotated around the axis L, the valve body 60 is opened and closed when opening and closing the valve chamber flow path. The pressure of the fuel G in the pipe 8 (the pressure of the fuel G at which the pressure regulating valve 1 operates) can be adjusted.

  In addition, by forming a groove that longitudinally cuts the outer peripheral surface of the large-diameter portion 68 of the valve body 60 in the direction of the axis L, the valve body 60 (large-diameter portion 68) and the large-diameter annular inner wall surface 41 of the valve chamber 55 are formed. A gap 75 may be provided.

DESCRIPTION OF SYMBOLS 1 ... Pressure regulating valve 11 ... 1st piping 12 ... 2nd piping 22 ... Valve chamber structural member 23 ... Nud part (annular wall part)
25a: Upper surface of the annular plate portion (first inner wall surface)
27 ... Female screw 32 ... Valve chamber component 41 ... Large-diameter annular inner wall surface (annular inner wall surface)
43 ... 1st annular surface (contact part)
45 ... second annular surface (second inner wall surface)
50 ... cylindrical portion 51 ... male screw 55 ... valve chamber 56 ... first opening 57 ... second opening 58 ... fuel outlet (fluid outlet)
59 ... Valve seat 60 ... Valve body 60A ... Valve body blocking position 61 ... Coil spring (biasing member)
62 ... Guide part 65 ... Valve seat component 68 ... Large diameter part 69 ... Valve small diameter part 73 ... Valve flow path 75 ... Gap 76 ... 1st pressure receiving surface 77 ... 2nd pressure receiving surface 80 ... Valve chamber flow path L ... Axis S ... Flow direction

Claims (8)

In the pressure regulating valve that is arranged between the first pipe and the second pipe and adjusts the pressure of the fluid flowing through the first pipe and the second pipe,
The first opening that communicates with the first pipe, the second opening that communicates with the second pipe, the fluid outlet, the annular valve seat, and the first opening and the fluid outlet through the central hole of the valve seat. A valve chamber having a valve chamber flow path to be connected, and
A valve element disposed on the downstream side of the valve seat in the fluid flow direction from the first opening toward the fluid outlet;
An urging member that urges the valve body to a blocking position that contacts the valve seat and blocks the valve chamber flow path;
The valve body includes a first pressure receiving surface that receives the pressure of the fluid on the first pipe side through the central hole of the valve seat and the first opening, and the second pipe through the second opening. A second pressure receiving surface that receives the pressure of the fluid on the side, and a valve body channel that has one end opening in the first pressure receiving surface and the other end opening in the second pressure receiving surface,
When the differential pressure between the pressure of the fluid applied to the first pressure receiving surface and the pressure of the fluid applied to the second pressure receiving surface is greater than the urging force of the urging member, the valve body separates from the valve seat. The first opening and the fluid outlet are in communication with each other. In claim 1,
The pressure regulating valve, wherein an area of the first pressure receiving surface is larger than an area of the second pressure receiving surface. In claim 1 or 2,
The first opening, the valve seat, the second opening, and the valve body are coaxial.
The valve body moves in an axial direction between the second opening and the valve seat,
The urging member is a coil spring, and is arranged coaxially with the valve body. In claim 3,
The valve chamber includes a first inner wall surface in which the first opening is formed, an annular inner wall surface extending in the axial direction on an outer peripheral side of the valve body, and the first inner wall surface surrounding the first opening. It has a cylindrical valve seat component that protrudes in the axial direction and includes the valve seat at the tip.
The fluid outlet is formed on the annular inner wall surface,
A gap is formed between the outer peripheral surface of the valve body and the annular inner wall surface,
The valve chamber flow path passes through the central hole of the valve seat component and the gap,
The first pressure receiving surface is an end surface portion that is exposed to the inside of the valve seat constituent portion when the valve body abuts on the valve seat among end faces of the valve body on the valve seat side. Pressure regulating valve characterized by In claim 4,
The pressure regulating valve, wherein the pressure loss of the fluid when flowing through the gap is larger than the pressure loss of the fluid flowing through the valve body flow path. In claim 4 or 5,
A first valve chamber component comprising the first inner wall surface;
A second valve chamber constituent member having a cylindrical portion provided with the annular inner wall surface,
The coil spring has an end portion on the first opening side that contacts the valve body, and an end portion on the second opening side that contacts an abutting portion provided in the second valve chamber constituting member,
The first valve chamber constituent member includes an annular wall portion extending in the axial direction on the outer peripheral side of the cylindrical portion,
The cylindrical portion includes a male screw on the outer peripheral surface,
The pressure regulating valve according to claim 1, wherein the annular wall portion includes a female screw that can be screwed to the male screw on an inner peripheral surface. In any one of claims 4 to 6,
The valve chamber includes a second inner wall surface in which the second opening is formed, and a cylindrical guide portion that guides the valve body in the axial direction.
The guide portion extends coaxially with the annular inner wall surface from the second inner wall surface toward the first inner wall surface.
The valve body has a large-diameter portion that can contact the valve seat from the valve seat side toward the second opening side, a smaller diameter than the large-diameter portion, and the axial direction from the large-diameter portion. A small diameter portion that extends into the guide portion and is inserted into the guide portion,
The small diameter portion is fitted to the guide portion in a state movable in the axial direction,
The second pressure receiving surface is an end surface of the small diameter portion on the second opening side,
The pressure regulating valve, wherein the second pressure receiving surface and the second inner wall surface are separated from each other. In claim 7,
The coil spring is disposed coaxially with the guide portion on the outer peripheral side of the guide portion,
An end portion of the coil spring on the first opening side is in contact with the large diameter portion of the valve body from the second opening side.

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